Fire-alarm-telegraph system.



No. 867,494. PATBNTED OCT. 1, 1907.

M. GARL.

FIRE ALAR M TELEGRAPH SYSTEM. APPLIOATION FILED 001220. 1905.

k Q i M 2125 srny UNITED STATEQPATENT FTGE.

MANIOUS GARL, OF AKRON, OHIO.

FIRE-ALARM IELE GRAPH SYSTEM.

To all whom it may concern:

Be it known that I, MANIOUS GARL, a citizen of the United States ofAmerica, and a resident of Akron, in the county of Summit and State ofOhio, have invented certain new and useful Improvements in Fire-Alarm-Telegraph Systems, of which the following is a specification.

My invention relates to improvements in magnetoelectric fire-alarmtelegraphy, and has for its object the simplification of the system ofapparatus employed, the increase of its efliciency and the reduction ofcost thereof and expense of operation.

Hitherto, in fire-alarm telegraphy or other analogous systems, thecommon means for operating the apparatus has comprised'main and numerouslocal batteries; all of which are subject to deterioration and requirefrequent attention and renewal.

In the improved system herein disclosed, I have altogether eliminatedthe use of batteries, which by their nature are ill-adapted fortransmission over long circuits, and have employed instead, themagneto-electric generator for operating the system; arranging andadapting .the apparatus of said system in such manner as to be operatedmore efficiently thereby.

Details of the improved system of my invention will be more readilygathered by making reference to the accompanying drawings, illustratingan embodiment and apparatus of my invention, wherein Figure I. is apictorial diagram, showing a system of fire-alarm telegraph, equipped inaccordance with my invention; and, Fig; II. shows in perspective, twoimproved relays of my inventio'n, adapted for use therein anddiagrammatically connected to be employed alternatively.

The same character of reference has been used throughout the drawings toindicate similar parts and thereby avoid confusion.

In the diagram of Fig. I the central station and alarm apparatus for thefire-alarm telegraphic circuit, comprising in this instance, but twocall-boxes, is sufficiently set forth to explain the features of myimprovement. At the central station are the power magnetos M and M,adapted alternatively to supply current for the system, the taperegister T, the relays R, R, and the auxiliary testing, switching andalarm apparatus. Connected in circuit at any practicable distance fromthe station are the alarm or call-boxes O, C; these registeringrespectively 15 and 14. It will be observed that no batteries whatsoeverare associated with this circuit, and that all the electric power isderived from one or the other of the magnetos M, M, which arealternatively driven at such relatively high rate of speed as to impresscurrents upon the line, of sufficient frequency of alternation to actupon the controlling relay and retain it normally inoperative, Thiscurrent is transmitted over the line through the several call-boxes andreturns by metallic Specification of Letters Patent.

Application filed October 20,1905. Serial No. 283,626.

Patented Oct. 1, 1907.

circuit to the central office. The alarms, however, are primarilytransmitted over grounded circuits, temporarily opening the normalmetallic circuit of the system. This in turn denergizes thecontrolling-relay R or R, and causes it to close a local alarm circuit.Said relays are constructed to respond to alternating-currents; havingtheir windings connected respectively between binding-posts e or e, andthe frames, of said relays. The frames are respectively connected tobinding-posts e and c", and also serve as grounds for the local circuit,adapted to be closed between screws 1* and springs T2, when thecontrolling-relay is deenergized. This best appears in the diagrammaticrepresentation of Fig. 11. Assuming then that magneto M is beingemployed to operate the system, it will be seen that the normal circuitis traced from its left side over conductor 1, through call-boxes O, O,and any others that may be connected serially in circuit, over conductor2, through the windings of relay R, and conductors 3, 4 and 5 to theopposite terminal of the magneto. This will serve normally to excite therelay, causing its armature mounting r, to assume the vertical position.shown in the drawings and maintain its contact screw 1', out ofengagement with the spring r controlling the circuit to the alarmapparatus. When an alarm is sent in, however, which in my improvedapparatus is transmitted by releasing the weight 0 of box C, the toothedactuating wheel 0 will engage the spring 0 depressing it to disengagethe upper contact-spring and at the same time make a wiping l contactwith the grounding spring 0 intermittently during the rotation of saidwheel and thereby transmitting the signal 14 to the central office overthe grounded circuit thus momentarily established. A

As before, current may be traced from the left hand pole of magneto M,conductor 1 to box C over its ground connection G to the ground G oftape register T, through its electro-magnet t, connected betweenbinding-posts i, i, and conductors 4 and 5 to the other pole of themagneto. Current also flows to the ground G the alarm bell A, andconductor 5 to the magneto. This serves to strike upon said alarm helland to register upon the tape L, the signal 1 1, to indicate the boxfrom which the alarm is turned in. Similarly, during the opening of themetallic circuit conductor 2, relay R will be deenergized, thus causingits armature mounting to assume the position shown with respect to relayR, and closing the local circuit through the central station alarm bellsA, A, at contact 1' and sounding thereon as well, the signal 14. Thiscircuit may be traced from the left hand pole of magneto M, conductor 6,through the bells A, A in multiple, conductor 7, spring T2,contact-screw r to the irame of the relay, binding-post e, andconductors 3, 4 and 5 to the opposite pole of the magneto.

The several switches s to s are respectively shown open and closed forestablishing the respective circuits above set forth, but they mayreadily be changed in an obvious manner, to connect the other relay itin circuit, should the same become desirable or necessary. The severalalarm bells A, A and A will, of course, be positioned at the centralstation, at the ollice oi the chief ol police, and in the appropriateengine house, or elsewhere as the needs oi the particular system shalldictate.

Duplicate power magnetos and controlling relays are provided merely forthe purpose ol avoiding a breakdown ol' the service, in case any one ol'these is incapacitated l'or use. hloreover, it will be seen that thealarms may be sent in to the tape register and bell over the groundedcircuit, irrespective ol' the condition oi the metallic circuit 2.

There remain to be described merely, the operation 01' thetesting-switch S and certain ieatures with re spect to the prel'erredapparatus employed on circuit in practicing my invention. Thistesting-switch is equipped with contact arms 8 and s, respee ely adaptedto ground one or the other ol' the poles, either.

of magneto M or M, through the extension-bell E, to test the conditionof the system, while the central contact-arm s short-circuits the twogrounding-plates for arms 8, s, or it may be connected for other testingpurposes. Thus, if there be an accidental ground upon either side 01'the metallic line, the depression 01' the corresponding arm will serveto close the grounded extension-bell circuit, and ring bell E, whileshort-circuiting the operating magneto will permit the controllingrelayto engage its local-circuit contacts. As for example, ii there be aground upon line 2, the depression of arm 8* will close a circuit fromthe ground ol' extension bell E through said bell, the arm 8 theconductor extending to the right, through conductors 4, 5, magneto M,and conductors 1, 2, to the assumed accidental grdund. The loregoingfeatures, I may say, however, l'orm no part of my present invention, andare briefly set lorth herein only to outline the workings 01' apractical signal telegraph system. i

The magnetos, which I employ, may well be wound to 50,000 ohms, andbeing power driven, are sntl iciently strong individually to forcerapidly alternating currents over lines of extreme length, and thosepresenting conditions which would make battery transmissionimpracticable or impossible.

The relays, the electro-magnet tor the tape register, and theloud-ringing alarm bells may be wound to 1,000 ohms; while a 500 ohmbell E is sullicient [or testing.

Certain mechanical t'eatures indicated in the drawings, which I believeto be 01' importain-e, are the eiiective wiping-contact arrangement,secured for the springs in the alarm boxes, the spring printing-arm Lprovided upon the tape register, and the peculiar lorm oi relay aboveset lorth.

The spring contact-arm t takes up the slight vibration present in thearmature ol the tape register, under the inlluence of alternatingcurrents and insures a continuous mark, during the intermittent periodsof magnetic excitation, corresponding to theseparatc impulses of thetransmitted signal.

The relay armature r is pivotally mounted by means ol br side pieces 7"upon the magnet poles r Under the iulluence oi alternating currents, thearmature is drawn into the position indicated by relay it, therebybridging the magnetic gap between the pole pieces 1 and normallyseparating the contacts 2" and r.

it will now be appreciated how l have dispensed with separate sources ofdirect current in lire-alarm telegraphs, and have employed acoustantly-runniug magnetogenerator of rapidly alternating currents,which generator is more cilicicnt and cheaper in opcrating the systemdisclosed, than any other with which I am actprainted.

The l'oregoing details relating to the practical application oi myimprovement, and the apparatus above set forth, ol course, are notnecessary to the invention herein claimed; it being my desire andintention to protect by separate applications, the nttentable featuresabove referred to.

Accordingly, I claim herein, and desire to secure by Letters Patent,together with such modification as may be made by more skill, thei'ollowing:

1. In a tire alarm telegraph system, a normally closed line circuit,alarm transmitting :lppliuilccs connected therein, a normally openground circuit. suitable alarm apparatus therein. and a normally openlocal alarm circuit, said local circuit: being closed by the breaking oithe line circuit, and said ground circuit being closed and openedalternately with said line circuit.

:2. In a tire alarm telegraph system. a. single source olf current, anormally closed line circuit, alarm transmitting appliances connectedtherein, a normally open ground circuit', suitable alarm apparatustherein, and a normally open local alarm circuit, said local circuit.being closet'l by the breaking of the line circuit, said ground circmitbeing closed and opened alternately with said linc circuit, and all oisaid circuits being cnci ed by said single source oicurrent.

3. in a tire alarm telegraph system, a constantly driven generator ofalternating current, a normally closed line circuit, alarm transmittingappliances connected therein, a normally open ground circuit, suitablealarm apparatus therein, and a normally open local alarm circuit, saidlocal circuit being closed by the breaking oi the line circuit, saidground circuit beingcloscd and opened alternately with said linecircuit, and all of said circuits being energized by said generator.

4. In a tire alarm telegraph system, a constantly driven generator oialternating currcn, a normally closed line circuit, alarm transmittingappliances connected therein. a normally open ground circuit, suilublcalarm apparatus therein, a local alarm circuit, and a relay in said linecircuit: controlling said local alarm cir uit; to normally nminlain thelatter open, said ground circuit being closed and opened alternatelywith said line circuit, and all or said circuits being energized by saidsingle source of current.

Signed at Akron, Ohio, this 18th day of October, 1905, 1)., in thepresence of. two subscribing witnesses.

MANIOUS GARL.

Witnesses EnwAnn ll. \YALSI], Anni-arr Lrxx hawnnxci-i.

